The Mean Absolute Deviation (MAD) of a set of data
is the average distance
between each data value and the mean.

The steps to find the MAD include:1. find the mean (average)2. find the difference between each data value and the mean3. take the absolute value of each difference4. find the mean (average) of these differences

While we could work through each of these steps on the calculator's home screen,
let's, instead, try to utilize the calculator's features to minimize our work.
We will look at two different approaches to find the population MAD.

NOTE: When adding the entries in a list, be sure to use the sum( function which appears under LIST - MATH. Do not use the sigma notation ∑ from ALPHA-WINDOW, as it does not understand how to access numbers from a list.